package others;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Utils {

	public static String randomHash() {
		return randomHash(32);
	}

	public static String randomHash(int length) {
		return md5(System.currentTimeMillis() * Math.random() + "").substring(0, length);
	}

	public static String md5(String str) {
		String res = "";
		try {
			MessageDigest algorithm = MessageDigest.getInstance("MD5");
			algorithm.reset();
			algorithm.update(str.getBytes());
			byte[] md5 = algorithm.digest();
			String tmp = "";
			for (int i = 0; i < md5.length; i++) {
				tmp = (Integer.toHexString(0xFF & md5[i]));
				if (tmp.length() == 1) {
					res += "0" + tmp;
				} else {
					res += tmp;
				}
			}
		} catch (NoSuchAlgorithmException ex) {
		}
		return res;
	}
}